var ie4 = (document.all && !document.getElementById) ? true : false;
var ie5 = (document.all && document.getElementById) ? true : false;
var ns6 = (!document.all && document.getElementById) ? true : false;
var ns4 = (document.layers) ? true : false;

var emDlg = null;
var dt_started = false;

function EmTool (mapX_min, mapY_min, mapWidth, mapHeight) {
	this.start = emtoolStart;
	this.stop = emtoolStop;
}


function emtoolStart() {
	if (!dt_started) dt_started = true;
	emtoolOpenDialog();
}
function emtoolStop() {
	dt_started = false;
	emtoolCloseDialog();
}

function emtoolOpenDialog() {
	if (emDlg != null) {
		emDlg.focus();
		return;
	} else {
		if (ie4 || ie5 || ns6) {
			emDlg = OpenEmWindow();
		} else if (ns4) {
			emDlg = OpenEmWindow();
		//	emDlg = window.open(maptoolURL + '../em/em_index.asp?BrugerID=0', 'EmWindow', 'resizable=no,toolbar=no,status=no,menubar=no,location=no,width=170,height=100,top=40,left=100');		
		}
	}
}
	
	
function emtoolCloseDialog () {
	if (emDlg != null) {
		emDlg.close();
		emDlg = null;
		if (dt_started) {
			deselectTool();
		}
	}
}